For a couple of years now I've been steadily buying shares in North American unconventional (tight or shale) oil producers. Without planning it, my portfolio has evolved to consist almost exclusively of unconventional producers operating north of the Canada/U.S. border.
Why have I focused on Canadian unconventional? A simple answer, really: valuation.
I thought I'd compare an American producer -- SandRidge (SD) -- to a Canadian producer -- Petrobakken (PBKEF.PK) -- to show the valuation difference.